ݷʱ : 2024/12/24 9:25:34һ µȫĶ
λ bitwise exclusive OR ^ λ bitwise inclusive OR | logical AND && logical OR || conditional ?
ֵ assignment = += -= *= /= %= &= ^= |= <<= >>= >>>= 9 ụֱֻ̃́ӦJavaеЩ䣿
ụֻ̃́˳ṹ䣬ѡ䣬ѭ䣬ת/ת䡣
ѡӦJavaеif,if-else,Ƕif-else,switch-case ѭӦJavaеfor,while,do-while䡣 ת/תӦJavaеcontonue,break,return䡣 10 һѭʹbreak,continue,returnIJ break (ֹ)ѭ continue ѭ return
11 Ķ壬صࡣνijʼ Ķ壺һͬ͵ı**
ص㣺ͿǻͣͽӿڣÿԪصͬԪͨ[±]±()0ʼһĶ(Object)Զ () (ڴռ) ͷ (Java) ࣺһά顢ά顣
ʵ һ ѡ
1 Java,package˵һʱðIJνṹǣ B A. ļĽṹͬ B. ļĿ¼ͬ C. ļͬ D. ļСͬ
2 й췽ĵ÷ʽУȷǣ C A. һ㷽 B. ûֱӵ C. ֻͨnewԶ D. ϵͳ
3 int publicԱMAX_LENGTH,ֵΪ100
D
A. public int MAX_LENGTH=100 B. final int MAX_LENGTH=100
C. public const int MAX_LENGTH=100 D. public final int MAX_LENGTH=100 4 JavaУȷ B A. 췽ͬ
B. 췽ɳʼġ
C. 췽ֻ new ãܱûֱӵá D. 췽ûз͡
5 JavaУĸDzȷģ D A. ľ̬ڸĶǰ B. ľ̬ܷʸķǾ̬
C. abstract ηԳǰ棬ܳڱ֮ǰ D. final ηԳ֮ǰܳڷ֮ǰ 6 Javaѡ D ʵ˼Ļơ A. **. ̳ C. ̬
D. ת
7 WorkerPerson࣬Worker췽һ\䣨 C A. Workerжsuper() B. Personжsuper() C. PersonĹ캯 D.
8 Java£Test.java,ǣ C public class Test{
private static final int counter=10; public static void main(String [] args){ System.out.println(counter++); } }
A. 10 B. 11
C. D. ʱ쳣
9 Java룬ʱڣ D ִֻѡһ class Parent{ }
class Child extends Parent{
public static void main(String args[]){ Parent p1 = new Child(); //һ Parent p2 = new Parent(); //ڶ Child c1 = new Child(); // Child c2 = new Parent(); // } }
A. һ B. ڶ
C. D.
10 JavaУijʹУ B ηκԱʡ A. private B. protected C. public D. friendly
11 Java Уඨ壺 abstract class Shape{ abstract void draw(); }
class Square extends Shape{ }
ȷǣ B A. һгɹ
B. ShapeԱ룬Squareܱ C. SquareԱ룬Shapeܱ D. SquareShapeܱ 12 Java: class A{
public static void main(String[] args){ method(); }
static void method(){
System.out.println(\System.exit(0);
System.out.println(\} }
к,( A ) A. \B. \
C. \\D. 벻ܱ
13 ±finalηһõĽĶӦǶӦϵڴѡȷĶӦϵ C
1 A ٲ
2 B һֵͲܸ 3 Cи A. 1-A 2-B 3-C B. 1-C 2-A 3-B C. 1-B 2-C 3-A
D. 1-C 2-B 3-A 14 ³
public class ConstOver {
public ConstOver (int x, int y, int z) { } }
ĸConstOver췽 B A. protected int ConstOver (){ }
B. private ConstOver (int z, int y, byte x) { } C. public object ConstOver (int x, int y, int z) { } D. public void ConstOver (byte x, byte y, byte z) { } 15 ³ class BaseClass {
private float x = 1.0f ;
public float getVar() ( return x;) }
class Subclass extends BaseClass { private float x = 2.0f; // insert code here }
ĸӵеġ//insert code hereλЧض常ķ B A. protected float getVar (){ return x;} B. public float getVar() { return x;}
C. protected float double getVar() { return x;} D. public float getVar(float f) { return f;} 16 ָгеĽ B public class Example{
String str=new String(\ char[]ch={'a','b','c'};
public static void main(String args[]){ Example ex=new Example(); ex.change(ex.str,ex.ch);
System.out.print(ex.str+\and \ System.out.print(ex.ch); }
public void change(String str,char ch[]){ str=\ok\ ch[0]='g'; } }
A. good and abc B. good and gbc C. test ok and abc D. test ok and gbc
17 Щڴյ˵ȷ? B